private void OKButton_Click(object sender, RoutedEventArgs e) { SQLQuery mSqlQuery = new SQLQuery(); if (checkSalary() && roomID.SelectedIndex > -1) { int numOFRoom = int.Parse(roomID.Text.ToString()); mSqlQuery.updateRoomData(new Room(getRoomID[numOFRoom], numOFRoom, Int64.Parse(ID.Text))); mSqlQuery.updateStaffData(GlobalVariables.globalStaff); } else { MessageBox.Show("Please Enter the Room number", "Invaild Data", MessageBoxButton.OK, MessageBoxImage.Error); } }